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                <h1 class="post-title" itemprop="name headline"> OpenGL绘图实例八之图形的移动删除存盘 </h1>
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                <h2 id="综述"><a href="#综述" class="headerlink" title="综述"></a>综述</h2>
                <p>在上一篇文章中我们已经实现了图形的取点绘制，接下来我们还要实现的功能有图形的删除、移动以及存盘读盘功能。 概述如下</p>
                <ul>
                  <li>鼠标点击某个绘制的图形，将其删除</li>
                  <li>鼠标拖动某个图形，可以对其随意拖拽改变位置</li>
                  <li>点击存盘，将图形的位置及颜色保存到文件</li>
                  <li>点击读盘，将图形的位置颜色从文件中读取出来并重新绘制</li>
                </ul>
                <p>好，接下来我们在上一篇的基础上进行一步步的说明。</p>
                <h2 id="图形删除"><a href="#图形删除" class="headerlink" title="图形删除"></a>图形删除</h2>
                <p>首先像之前一样，我们定义一个删除的按钮，指定好颜色。</p>
                <figure class="highlight angelscript">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">GLubyte delBtn[<span class="number">3</span>] = &#123;<span class="number">30</span>, <span class="number">30</span>, <span class="number">30</span>&#125;;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>在display函数中绘制一个删除的按钮</p>
                <figure class="highlight angelscript">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">glColorCircle(<span class="number">220</span>, <span class="number">280</span>, <span class="number">10</span>, delBtn);</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>顶部变变成了这个样子，其中最左边的那个按钮便是删除按钮 <a href="http://qiniu.cuiqingcai.com/wp-content/uploads/2015/05/QQ截图20150511124225.jpg" target="_blank" rel="noopener"><img src="http://qiniu.cuiqingcai.com/wp-content/uploads/2015/05/QQ截图20150511124225.jpg" alt="QQ截图20150511124225"></a> 接下来我们想一下删除的实现。 首先我们点击删除按钮之后要设置一下drawStatus，比如设置为2代表删除。 然后鼠标点击下方任意位置时，如果当前drawStatus为2，如果鼠标处在一个多边形内部，我们就把它删除掉。 那么就会出现两个问题了，怎样判断点击的点处在多边形的内部？怎样执行删除操作？ 下面我们分别来研究一下</p>
                <h3 id="1-判断点在多边形内部"><a href="#1-判断点在多边形内部" class="headerlink" title="1. 判断点在多边形内部"></a>1. 判断点在多边形内部</h3>
                <p>思路：求解通过该点的水平线与多边形各边的交点 ，如果交点为奇数，那么就判定为在多边形内部，否则在外部。 因此，我的算法实现如下，传入的参数一个是ploygon结构体，结构体中包含了顶点坐标，另外就是这个点的x，y坐标。 思路参考来源： <a href="http://blog.csdn.net/hgl868/article/details/7947272" target="_blank" rel="noopener">判断点在多边形内的多种写法</a> 经过我的改写，变成了如下内容</p>
                <figure class="highlight smali">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">/* 判断一个点是否在多边形内部 */</span><br><span class="line">bool pointInPoly(polygon poly,<span class="built_in"> int </span>x,<span class="built_in"> int </span>y)&#123;</span><br><span class="line"><span class="built_in">	int </span>nCross = 0;</span><br><span class="line">	for (int i = 0; i &lt; poly.verNum; i++) &#123;</span><br><span class="line">	<span class="built_in">	int </span>p1x = poly.x[i];</span><br><span class="line">	<span class="built_in">	int </span>p1y = poly.y[i];</span><br><span class="line">	<span class="built_in">	int </span>p2x = poly.x[(i + 1) % poly.verNum];</span><br><span class="line">	<span class="built_in">	int </span>p2y = poly.y[(i + 1) % poly.verNum];</span><br><span class="line">		/* 平行或在延长线上，忽略 */</span><br><span class="line">	<span class="built_in">	if </span>(p1y == p2y || y &lt; min(p1y, p2y) || y &gt; max(p1y, p2y)) &#123;</span><br><span class="line">			continue;</span><br><span class="line">		&#125;</span><br><span class="line">		/* 计算交点横坐标 */</span><br><span class="line">	<span class="built_in">	double </span>m = (double)(y - p1y) * (double)(p2x - p1x) / (double)(p2y - p1y) + p1x; </span><br><span class="line">	<span class="built_in">	if </span>( m &gt; x ) nCross++; </span><br><span class="line">	&#125;</span><br><span class="line"><span class="built_in">	return </span>(nCross % 2 == 1); </span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
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                <p>以上便是判断在多边形内部的算法。</p>
                <h3 id="2-删除图形实现"><a href="#2-删除图形实现" class="headerlink" title="2.删除图形实现"></a>2.删除图形实现</h3>
                <p>好了，有了上面的算法，我们就依次查找我们声明的 polygons 数组，找到第一个符合要求的多边形结构体 polygon 返回它的索引。 这个方法就是传入了点击点的位置x，y坐标，然后判断是在哪个多边形内，然后移除之。如果没有找到，则不执行删除操作。</p>
                <figure class="highlight reasonml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">/* 删除多边形 */</span></span><br><span class="line">void delete<span class="constructor">Poly(<span class="params">int</span> <span class="params">x</span>, <span class="params">int</span> <span class="params">y</span>)</span> &#123;</span><br><span class="line">	<span class="built_in">int</span> delenum = -<span class="number">1</span>;</span><br><span class="line">	for (<span class="built_in">int</span> i = <span class="number">0</span>; i&lt; con; i++) &#123;</span><br><span class="line">		<span class="keyword">if</span> (point<span class="constructor">InPoly(<span class="params">polygons</span>[<span class="params">i</span>], <span class="params">x</span>, <span class="params">y</span>)</span>) &#123;</span><br><span class="line">			delenum = i;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">if</span> (delenum != -<span class="number">1</span>) &#123;</span><br><span class="line">		remove<span class="constructor">Poly(<span class="params">delenum</span>)</span>;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">/* 重新绘制 */</span></span><br><span class="line">	glut<span class="constructor">PostRedisplay()</span>;</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>其中 removePoly(delenum) 就是通过传入这个结构体的索引，然后将它从polygons里面删除即可，方法实现如下</p>
                <figure class="highlight pgsql">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">/* 删除多边形 */</span></span><br><span class="line"><span class="type">void</span> removePoly(<span class="type">int</span> <span class="keyword">index</span>)</span><br><span class="line">&#123;</span><br><span class="line">	<span class="keyword">if</span> (<span class="keyword">index</span>&gt;con) &#123;</span><br><span class="line">		printf("Out Of Index\n");</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">for</span> (<span class="type">int</span> i = <span class="keyword">index</span>; i &lt; con; i++) &#123;</span><br><span class="line">		polygons[i] = polygons[i+<span class="number">1</span>];</span><br><span class="line">	&#125;</span><br><span class="line">	con<span class="comment">--;</span></span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>其实就是相当于从数组中移除一个元素，然后后面的元素依次前移。 恩好了，准备工作都做好了，我们只需要在点击了删除按钮之后，调用一下deletePoly函数即可。 把原来的mouseClick方法改写如下即可，代码较长，不完全展开，<strong>双击查看完整代码</strong></p>
                <figure class="highlight reasonml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">/*鼠标点击事件 */</span></span><br><span class="line">void mouse<span class="constructor">Click(<span class="params">int</span> <span class="params">btn</span>, <span class="params">int</span> <span class="params">state</span>, <span class="params">int</span> <span class="params">x</span>, <span class="params">int</span> <span class="params">y</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">	<span class="comment">/* 选项卡的分界范围 */</span></span><br><span class="line">	<span class="built_in">int</span> optionHeight = <span class="number">40</span>;</span><br><span class="line">	<span class="built_in">int</span> optionWidth = <span class="number">250</span>;</span><br><span class="line">	<span class="keyword">if</span> (btn<span class="operator"> == </span>GLUT_LEFT_BUTTON<span class="operator"> &amp;&amp; </span>state<span class="operator"> == </span>GLUT_DOWN)</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="comment">/* 如果在颜色选项卡中点击 */</span></span><br><span class="line">		<span class="keyword">if</span> (y &lt; optionHeight<span class="operator"> &amp;&amp; </span>x &lt; optionWidth)</span><br><span class="line">		&#123;</span><br><span class="line">			gl<span class="constructor">ReadPixels(<span class="params">x</span>, 2 <span class="operator">*</span> <span class="params">halfHeight</span> - <span class="params">y</span>, 1, 1, GL_RGB, GL_UNSIGNED_BYTE, &amp;<span class="params">nowColor</span>)</span>;</span><br><span class="line">			printf(<span class="string">"r:%d,g:%d,b:%d\n"</span>, nowColor<span class="literal">[<span class="number">0</span>]</span>, nowColor<span class="literal">[<span class="number">1</span>]</span>, nowColor<span class="literal">[<span class="number">2</span>]</span>);</span><br><span class="line">			<span class="comment">/* 设置绘图颜色并显示当前取色板颜色 */</span></span><br><span class="line">			gl<span class="constructor">ColorCircle(-180, 280, 10, <span class="params">nowColor</span>)</span>;</span><br><span class="line">		<span class="comment">/* 如果点击的是右侧选项按钮 */</span></span><br><span class="line">		&#125;<span class="keyword">else</span> <span class="keyword">if</span> (y &lt; optionHeight<span class="operator"> &amp;&amp; </span>x &gt; optionWidth) &#123;</span><br><span class="line">			<span class="comment">//取当前的点</span></span><br><span class="line">			GLubyte color<span class="literal">[<span class="number">3</span>]</span>;</span><br><span class="line">			gl<span class="constructor">ReadPixels(<span class="params">x</span>, 2 <span class="operator">*</span> <span class="params">halfHeight</span> - <span class="params">y</span>, 1, 1, GL_RGB, GL_UNSIGNED_BYTE, &amp;<span class="params">color</span>)</span>;</span><br><span class="line">			printf(<span class="string">"r:%d,g:%d,b:%d\n"</span>, color<span class="literal">[<span class="number">0</span>]</span>, color<span class="literal">[<span class="number">1</span>]</span>, color<span class="literal">[<span class="number">2</span>]</span>);</span><br><span class="line">			<span class="comment">/* 如果点击了开始绘制的按钮 */</span></span><br><span class="line">			<span class="keyword">if</span> (same<span class="constructor">Color(<span class="params">color</span>, <span class="params">startBtn</span>)</span>) &#123;</span><br><span class="line">				drawStatus = <span class="number">0</span>;</span><br><span class="line">				<span class="comment">/* 开始画一个图形，顶点个数置零 */</span></span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.verNum = <span class="number">0</span>;</span><br><span class="line">				printf(<span class="string">"drawStatus:%d\n"</span>, drawStatus);</span><br><span class="line">			<span class="comment">/* 如果点击了结束绘制的按钮 */</span></span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> (same<span class="constructor">Color(<span class="params">color</span>, <span class="params">endBtn</span>)</span>) &#123;</span><br><span class="line">				glut<span class="constructor">PostRedisplay()</span>;</span><br><span class="line">				<span class="comment">/* 画的图形个数加一 */</span></span><br><span class="line">				con++;</span><br><span class="line">				printf(<span class="string">"drawStatus:%d\n"</span>, drawStatus);</span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> (same<span class="constructor">Color(<span class="params">color</span>, <span class="params">delBtn</span>)</span>) &#123;</span><br><span class="line">				<span class="comment">/* 删除时设置drawStatus为2 */</span></span><br><span class="line">				drawStatus = <span class="number">2</span>;</span><br><span class="line">				printf(<span class="string">"drawStatus:%d\n"</span>, drawStatus);</span><br><span class="line">			&#125;</span><br><span class="line"></span><br><span class="line">		<span class="comment">/* 如果点击的是下方的绘图页面 */</span></span><br><span class="line">		&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">			<span class="comment">/* 如果当前是正在取点状态 */</span></span><br><span class="line">			<span class="keyword">if</span> (drawStatus<span class="operator"> == </span><span class="number">0</span>)</span><br><span class="line">			&#123;</span><br><span class="line">				<span class="comment">/* 保存每个点，然后该图形顶点个数加一 */</span></span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.x<span class="literal">[<span class="identifier">polygons</span>[<span class="identifier">con</span>]</span>.verNum]	= x;</span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.y<span class="literal">[<span class="identifier">polygons</span>[<span class="identifier">con</span>]</span>.verNum]	= y;</span><br><span class="line">				<span class="comment">/* 画点 */</span></span><br><span class="line">				gl<span class="constructor">Points(<span class="params">x</span>, <span class="params">y</span>)</span>;</span><br><span class="line">				<span class="comment">/* 设置当前颜色RGB，如果取色有变动，以最后的取色为准 */</span> </span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">0</span>]</span> = nowColor<span class="literal">[<span class="number">0</span>]</span>;</span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">1</span>]</span> = nowColor<span class="literal">[<span class="number">1</span>]</span>;</span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">2</span>]</span> = nowColor<span class="literal">[<span class="number">2</span>]</span>;</span><br><span class="line">				printf(<span class="string">"polyColor%d%d%d\n"</span>, polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">0</span>]</span>,polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">1</span>]</span>,polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">2</span>]</span>);</span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.verNum++;</span><br><span class="line">				printf(<span class="string">"con:%d,verNum:%d\n"</span>, con, polygons<span class="literal">[<span class="identifier">con</span>]</span>.verNum);</span><br><span class="line">			&#125;<span class="keyword">else</span> <span class="keyword">if</span> (drawStatus<span class="operator"> == </span><span class="number">2</span>) &#123;</span><br><span class="line">				<span class="comment">/* 删除图形 */</span></span><br><span class="line">				delete<span class="constructor">Poly(<span class="params">x</span>, <span class="params">y</span>)</span>;</span><br><span class="line">			&#125; </span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>经过上面的步骤，我们便可以很方便地实现图形的删除了。运行结果如下</p>
                <p>[embed]<a href="http://qiniu.cuiqingcai.com/robot2.mp4[/embed" target="_blank" rel="noopener">http://qiniu.cuiqingcai.com/robot2.mp4[/embed</a>]</p>
                <p>嗯，就是这样，现在删除就大功告成了。</p>
                <h2 id="移动图形"><a href="#移动图形" class="headerlink" title="移动图形"></a>移动图形</h2>
                <p>像之前一样，定义一个移动图形的按钮。在此不再赘述</p>
                <figure class="highlight angelscript">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">GLubyte moveBtn[<span class="number">3</span>] = &#123;<span class="number">40</span>, <span class="number">40</span>, <span class="number">40</span>&#125;;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight angelscript">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">glColorCircle(<span class="number">190</span>, <span class="number">280</span>, <span class="number">10</span>, moveBtn);</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>那么图形移动怎么实现？思路如下 首先利用判断点击的点是否在多边形内部的算法，找到需要移动的多边形。然后在监听鼠标移动的事件中设置这个多边形各个顶点的相对移动距离等于鼠标相对移动距离即可。 首先，移动的drawSatus我们设置为3，在mouseClick方法中加入如下部分，在哪加你应该已经知道了。</p>
                <figure class="highlight reasonml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="keyword">else</span> <span class="keyword">if</span> (same<span class="constructor">Color(<span class="params">color</span>, <span class="params">moveBtn</span>)</span>) &#123;</span><br><span class="line">				<span class="comment">/* 移动时设置drawStatus为3 */</span></span><br><span class="line">				drawStatus = <span class="number">3</span>;</span><br><span class="line">				printf(<span class="string">"drawStatus:%d\n"</span>, drawStatus);</span><br><span class="line">			&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>在mouseMove方法中（另一个监听鼠标移动的事件）中首先判断当前的drawStatus如果为3，那么就执行移动操作。 加入如下的方法即可。</p>
                <figure class="highlight reasonml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">/* 鼠标移动事件 */</span></span><br><span class="line">void mouse<span class="constructor">Move(<span class="params">int</span> <span class="params">x</span>, <span class="params">int</span> <span class="params">y</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">	<span class="keyword">if</span>(drawStatus<span class="operator"> == </span><span class="number">3</span><span class="operator"> &amp;&amp; </span>moveNum != -<span class="number">1</span>)&#123;</span><br><span class="line">		printf(<span class="string">"move x:%d,y:%dmoveNum:%d\n"</span>, x, y,moveNum);</span><br><span class="line">		move<span class="constructor">Poly(<span class="params">x</span>, <span class="params">y</span>)</span>;</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>这里两点需要说明，moveNum就是我们需要移动的图形的索引，定义为了全局变量。在鼠标点击时，首先判定点击点在哪个图形中，然而因为有两个鼠标事件（一个是点击，一个是移动），所以就把这个变量定义为全局变量，来标记该移动哪个图形。moveNum的初始值为-1，如果为-1，那么就代表没有选中任何图形，不移动。如果不是-1，就进行移动。 其次，movePloy方法实现如下</p>
                <figure class="highlight gml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">/* 移动多边形 */</span></span><br><span class="line">void movePoly(int <span class="symbol">x</span>, int <span class="symbol">y</span>) &#123;</span><br><span class="line">	<span class="comment">/* 取到要移动的图形 */</span></span><br><span class="line">	int verNum = polygons[moveNum].verNum;</span><br><span class="line">	printf(<span class="string">"verNum%d,x%d,y%d,clickX%d,clickY%d\n"</span>,verNum,<span class="symbol">x</span>,<span class="symbol">y</span>,clickX,clickY);</span><br><span class="line">	<span class="keyword">for</span> (int i = <span class="number">0</span>; i &lt; verNum; i++) &#123;</span><br><span class="line">		polygons[moveNum].<span class="symbol">x</span>[i] += (<span class="symbol">x</span> - clickX);</span><br><span class="line">		polygons[moveNum].<span class="symbol">y</span>[i] += (<span class="symbol">y</span> - clickY); </span><br><span class="line">		printf(<span class="string">"polyx%d\n"</span>,polygons[moveNum].<span class="symbol">x</span>[i]);</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">/* 移动完毕之后重新记录当前的点 */</span></span><br><span class="line">	clickX = <span class="symbol">x</span>;</span><br><span class="line">	clickY = <span class="symbol">y</span>;</span><br><span class="line">	<span class="comment">/* 重新绘制 */</span></span><br><span class="line">	glutPostRedisplay();</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>这个方法的实现有一部分需要说明，首先是clickX，clickY。 因为在移动时移动的是相对距离。所以，鼠标每移动一个像素，我们就要计算下一步鼠标移动的位置和上一个位置的差值，所以每次移动我们都需要标记一下点击的位置。所以上面的方法中才有了</p>
                <figure class="highlight gml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">/* 移动完毕之后重新记录当前的点 */</span></span><br><span class="line">	clickX = <span class="symbol">x</span>;</span><br><span class="line">	clickY = <span class="symbol">y</span>;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>然后，在图形移动时，我们需要移动的是相对位置。所以我们将一个图形的所有顶点进行遍历，加上鼠标移动的相对位置即可。就是如下的实现</p>
                <figure class="highlight lisp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">for (<span class="name">int</span> i = <span class="number">0</span><span class="comment">; i &lt; verNum; i++) &#123;</span></span><br><span class="line">		polygons[moveNum].x[i] += (<span class="name">x</span> - clickX)<span class="comment">;</span></span><br><span class="line">		polygons[moveNum].y[i] += (<span class="name">y</span> - clickY)<span class="comment">; </span></span><br><span class="line">	&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>另外，mouseClick方法中我们需要调用一下即可。mouseClick方法现在改写如下</p>
                <figure class="highlight reasonml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">/*鼠标点击事件 */</span></span><br><span class="line">void mouse<span class="constructor">Click(<span class="params">int</span> <span class="params">btn</span>, <span class="params">int</span> <span class="params">state</span>, <span class="params">int</span> <span class="params">x</span>, <span class="params">int</span> <span class="params">y</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">	<span class="comment">/* 赋值全局变量 */</span></span><br><span class="line">		clickX = x;</span><br><span class="line">		clickY = y;</span><br><span class="line">	<span class="comment">/* 选项卡的分界范围 */</span></span><br><span class="line">	<span class="built_in">int</span> optionHeight = <span class="number">40</span>;</span><br><span class="line">	<span class="built_in">int</span> optionWidth = <span class="number">250</span>;</span><br><span class="line">	<span class="keyword">if</span> (btn<span class="operator"> == </span>GLUT_LEFT_BUTTON<span class="operator"> &amp;&amp; </span>state<span class="operator"> == </span>GLUT_DOWN)</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="comment">/* 如果在颜色选项卡中点击 */</span></span><br><span class="line">		<span class="keyword">if</span> (y &lt; optionHeight<span class="operator"> &amp;&amp; </span>x &lt; optionWidth)</span><br><span class="line">		&#123;</span><br><span class="line">			gl<span class="constructor">ReadPixels(<span class="params">x</span>, 2 <span class="operator">*</span> <span class="params">halfHeight</span> - <span class="params">y</span>, 1, 1, GL_RGB, GL_UNSIGNED_BYTE, &amp;<span class="params">nowColor</span>)</span>;</span><br><span class="line">			printf(<span class="string">"r:%d,g:%d,b:%d\n"</span>, nowColor<span class="literal">[<span class="number">0</span>]</span>, nowColor<span class="literal">[<span class="number">1</span>]</span>, nowColor<span class="literal">[<span class="number">2</span>]</span>);</span><br><span class="line">			<span class="comment">/* 设置绘图颜色并显示当前取色板颜色 */</span></span><br><span class="line">			gl<span class="constructor">ColorCircle(-180, 280, 10, <span class="params">nowColor</span>)</span>;</span><br><span class="line">		<span class="comment">/* 如果点击的是右侧选项按钮 */</span></span><br><span class="line">		&#125;<span class="keyword">else</span> <span class="keyword">if</span> (y &lt; optionHeight<span class="operator"> &amp;&amp; </span>x &gt; optionWidth) &#123;</span><br><span class="line">			<span class="comment">//取当前的点</span></span><br><span class="line">			GLubyte color<span class="literal">[<span class="number">3</span>]</span>;</span><br><span class="line">			gl<span class="constructor">ReadPixels(<span class="params">x</span>, 2 <span class="operator">*</span> <span class="params">halfHeight</span> - <span class="params">y</span>, 1, 1, GL_RGB, GL_UNSIGNED_BYTE, &amp;<span class="params">color</span>)</span>;</span><br><span class="line">			printf(<span class="string">"r:%d,g:%d,b:%d\n"</span>, color<span class="literal">[<span class="number">0</span>]</span>, color<span class="literal">[<span class="number">1</span>]</span>, color<span class="literal">[<span class="number">2</span>]</span>);</span><br><span class="line">			<span class="comment">/* 如果点击了开始绘制的按钮 */</span></span><br><span class="line">			<span class="keyword">if</span> (same<span class="constructor">Color(<span class="params">color</span>, <span class="params">startBtn</span>)</span>) &#123;</span><br><span class="line">				drawStatus = <span class="number">0</span>;</span><br><span class="line">				<span class="comment">/* 开始画一个图形，顶点个数置零 */</span></span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.verNum = <span class="number">0</span>;</span><br><span class="line">				printf(<span class="string">"drawStatus:%d\n"</span>, drawStatus);</span><br><span class="line">			<span class="comment">/* 如果点击了结束绘制的按钮 */</span></span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> (same<span class="constructor">Color(<span class="params">color</span>, <span class="params">endBtn</span>)</span>) &#123;</span><br><span class="line">				glut<span class="constructor">PostRedisplay()</span>;</span><br><span class="line">				<span class="comment">/* 画的图形个数加一 */</span></span><br><span class="line">				con++;</span><br><span class="line">				printf(<span class="string">"drawStatus:%d\n"</span>, drawStatus);</span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> (same<span class="constructor">Color(<span class="params">color</span>, <span class="params">delBtn</span>)</span>) &#123;</span><br><span class="line">				<span class="comment">/* 删除时设置drawStatus为2 */</span></span><br><span class="line">				drawStatus = <span class="number">2</span>;</span><br><span class="line">				printf(<span class="string">"drawStatus:%d\n"</span>, drawStatus);</span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> (same<span class="constructor">Color(<span class="params">color</span>, <span class="params">moveBtn</span>)</span>) &#123;</span><br><span class="line">				<span class="comment">/* 移动时设置drawStatus为3 */</span></span><br><span class="line">				drawStatus = <span class="number">3</span>;</span><br><span class="line">				printf(<span class="string">"drawStatus:%d\n"</span>, drawStatus);</span><br><span class="line">			&#125;</span><br><span class="line"></span><br><span class="line">		<span class="comment">/* 如果点击的是下方的绘图页面 */</span></span><br><span class="line">		&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">			<span class="comment">/* 如果当前是正在取点状态 */</span></span><br><span class="line">			<span class="keyword">if</span> (drawStatus<span class="operator"> == </span><span class="number">0</span>)</span><br><span class="line">			&#123;</span><br><span class="line">				<span class="comment">/* 保存每个点，然后该图形顶点个数加一 */</span></span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.x<span class="literal">[<span class="identifier">polygons</span>[<span class="identifier">con</span>]</span>.verNum]	= x;</span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.y<span class="literal">[<span class="identifier">polygons</span>[<span class="identifier">con</span>]</span>.verNum]	= y;</span><br><span class="line">				<span class="comment">/* 画点 */</span></span><br><span class="line">				gl<span class="constructor">Points(<span class="params">x</span>, <span class="params">y</span>)</span>;</span><br><span class="line">				<span class="comment">/* 设置当前颜色RGB，如果取色有变动，以最后的取色为准 */</span> </span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">0</span>]</span> = nowColor<span class="literal">[<span class="number">0</span>]</span>;</span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">1</span>]</span> = nowColor<span class="literal">[<span class="number">1</span>]</span>;</span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">2</span>]</span> = nowColor<span class="literal">[<span class="number">2</span>]</span>;</span><br><span class="line">				printf(<span class="string">"polyColor%d%d%d\n"</span>, polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">0</span>]</span>,polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">1</span>]</span>,polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">2</span>]</span>);</span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.verNum++;</span><br><span class="line">				printf(<span class="string">"con:%d,verNum:%d\n"</span>, con, polygons<span class="literal">[<span class="identifier">con</span>]</span>.verNum);</span><br><span class="line">			&#125;<span class="keyword">else</span> <span class="keyword">if</span> (drawStatus<span class="operator"> == </span><span class="number">2</span>) &#123;</span><br><span class="line">				<span class="comment">/* 删除图形 */</span></span><br><span class="line">				delete<span class="constructor">Poly(<span class="params">x</span>, <span class="params">y</span>)</span>;</span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span>(drawStatus<span class="operator"> == </span><span class="number">3</span>) &#123;</span><br><span class="line">				moveNum = -<span class="number">1</span>;</span><br><span class="line">				for (<span class="built_in">int</span> i = <span class="number">0</span>; i&lt; con; i++) &#123;</span><br><span class="line">					<span class="keyword">if</span> (point<span class="constructor">InPoly(<span class="params">polygons</span>[<span class="params">i</span>], <span class="params">x</span>, <span class="params">y</span>)</span>) &#123;</span><br><span class="line">						moveNum = i;</span><br><span class="line">					&#125;</span><br><span class="line">				&#125;</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>好，现在就大功告成了，看一下运行结果吧</p>
                <p>[embed]<a href="http://qiniu.cuiqingcai.com/robot3.mp4[/embed" target="_blank" rel="noopener">http://qiniu.cuiqingcai.com/robot3.mp4[/embed</a>]</p>
                <p>现在完整的代码如下，代码过长，不完全显示，<strong>双击查看完整代码</strong></p>
                <figure class="highlight arduino">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br><span class="line">148</span><br><span class="line">149</span><br><span class="line">150</span><br><span class="line">151</span><br><span class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br><span class="line">156</span><br><span class="line">157</span><br><span class="line">158</span><br><span class="line">159</span><br><span class="line">160</span><br><span class="line">161</span><br><span class="line">162</span><br><span class="line">163</span><br><span class="line">164</span><br><span class="line">165</span><br><span class="line">166</span><br><span class="line">167</span><br><span class="line">168</span><br><span class="line">169</span><br><span class="line">170</span><br><span class="line">171</span><br><span class="line">172</span><br><span class="line">173</span><br><span class="line">174</span><br><span class="line">175</span><br><span class="line">176</span><br><span class="line">177</span><br><span class="line">178</span><br><span class="line">179</span><br><span class="line">180</span><br><span class="line">181</span><br><span class="line">182</span><br><span class="line">183</span><br><span class="line">184</span><br><span class="line">185</span><br><span class="line">186</span><br><span class="line">187</span><br><span class="line">188</span><br><span class="line">189</span><br><span class="line">190</span><br><span class="line">191</span><br><span class="line">192</span><br><span class="line">193</span><br><span class="line">194</span><br><span class="line">195</span><br><span class="line">196</span><br><span class="line">197</span><br><span class="line">198</span><br><span class="line">199</span><br><span class="line">200</span><br><span class="line">201</span><br><span class="line">202</span><br><span class="line">203</span><br><span class="line">204</span><br><span class="line">205</span><br><span class="line">206</span><br><span class="line">207</span><br><span class="line">208</span><br><span class="line">209</span><br><span class="line">210</span><br><span class="line">211</span><br><span class="line">212</span><br><span class="line">213</span><br><span class="line">214</span><br><span class="line">215</span><br><span class="line">216</span><br><span class="line">217</span><br><span class="line">218</span><br><span class="line">219</span><br><span class="line">220</span><br><span class="line">221</span><br><span class="line">222</span><br><span class="line">223</span><br><span class="line">224</span><br><span class="line">225</span><br><span class="line">226</span><br><span class="line">227</span><br><span class="line">228</span><br><span class="line">229</span><br><span class="line">230</span><br><span class="line">231</span><br><span class="line">232</span><br><span class="line">233</span><br><span class="line">234</span><br><span class="line">235</span><br><span class="line">236</span><br><span class="line">237</span><br><span class="line">238</span><br><span class="line">239</span><br><span class="line">240</span><br><span class="line">241</span><br><span class="line">242</span><br><span class="line">243</span><br><span class="line">244</span><br><span class="line">245</span><br><span class="line">246</span><br><span class="line">247</span><br><span class="line">248</span><br><span class="line">249</span><br><span class="line">250</span><br><span class="line">251</span><br><span class="line">252</span><br><span class="line">253</span><br><span class="line">254</span><br><span class="line">255</span><br><span class="line">256</span><br><span class="line">257</span><br><span class="line">258</span><br><span class="line">259</span><br><span class="line">260</span><br><span class="line">261</span><br><span class="line">262</span><br><span class="line">263</span><br><span class="line">264</span><br><span class="line">265</span><br><span class="line">266</span><br><span class="line">267</span><br><span class="line">268</span><br><span class="line">269</span><br><span class="line">270</span><br><span class="line">271</span><br><span class="line">272</span><br><span class="line">273</span><br><span class="line">274</span><br><span class="line">275</span><br><span class="line">276</span><br><span class="line">277</span><br><span class="line">278</span><br><span class="line">279</span><br><span class="line">280</span><br><span class="line">281</span><br><span class="line">282</span><br><span class="line">283</span><br><span class="line">284</span><br><span class="line">285</span><br><span class="line">286</span><br><span class="line">287</span><br><span class="line">288</span><br><span class="line">289</span><br><span class="line">290</span><br><span class="line">291</span><br><span class="line">292</span><br><span class="line">293</span><br><span class="line">294</span><br><span class="line">295</span><br><span class="line">296</span><br><span class="line">297</span><br><span class="line">298</span><br><span class="line">299</span><br><span class="line">300</span><br><span class="line">301</span><br><span class="line">302</span><br><span class="line">303</span><br><span class="line">304</span><br><span class="line">305</span><br><span class="line">306</span><br><span class="line">307</span><br><span class="line">308</span><br><span class="line">309</span><br><span class="line">310</span><br><span class="line">311</span><br><span class="line">312</span><br><span class="line">313</span><br><span class="line">314</span><br><span class="line">315</span><br><span class="line">316</span><br><span class="line">317</span><br><span class="line">318</span><br><span class="line">319</span><br><span class="line">320</span><br><span class="line">321</span><br><span class="line">322</span><br><span class="line">323</span><br><span class="line">324</span><br><span class="line">325</span><br><span class="line">326</span><br><span class="line">327</span><br><span class="line">328</span><br><span class="line">329</span><br><span class="line">330</span><br><span class="line">331</span><br><span class="line">332</span><br><span class="line">333</span><br><span class="line">334</span><br><span class="line">335</span><br><span class="line">336</span><br><span class="line">337</span><br><span class="line">338</span><br><span class="line">339</span><br><span class="line">340</span><br><span class="line">341</span><br><span class="line">342</span><br><span class="line">343</span><br><span class="line">344</span><br><span class="line">345</span><br><span class="line">346</span><br><span class="line">347</span><br><span class="line">348</span><br><span class="line">349</span><br><span class="line">350</span><br><span class="line">351</span><br><span class="line">352</span><br><span class="line">353</span><br><span class="line">354</span><br><span class="line">355</span><br><span class="line">356</span><br><span class="line">357</span><br><span class="line">358</span><br><span class="line">359</span><br><span class="line">360</span><br><span class="line">361</span><br><span class="line">362</span><br><span class="line">363</span><br><span class="line">364</span><br><span class="line">365</span><br><span class="line">366</span><br><span class="line">367</span><br><span class="line">368</span><br><span class="line">369</span><br><span class="line">370</span><br><span class="line">371</span><br><span class="line">372</span><br><span class="line">373</span><br><span class="line">374</span><br><span class="line">375</span><br><span class="line">376</span><br><span class="line">377</span><br><span class="line">378</span><br><span class="line">379</span><br><span class="line">380</span><br><span class="line">381</span><br><span class="line">382</span><br><span class="line">383</span><br><span class="line">384</span><br><span class="line">385</span><br><span class="line">386</span><br><span class="line">387</span><br><span class="line">388</span><br><span class="line">389</span><br><span class="line">390</span><br><span class="line">391</span><br><span class="line">392</span><br><span class="line">393</span><br><span class="line">394</span><br><span class="line">395</span><br><span class="line">396</span><br><span class="line">397</span><br><span class="line">398</span><br><span class="line">399</span><br><span class="line">400</span><br><span class="line">401</span><br><span class="line">402</span><br><span class="line">403</span><br><span class="line">404</span><br><span class="line">405</span><br><span class="line">406</span><br><span class="line">407</span><br><span class="line">408</span><br><span class="line">409</span><br><span class="line">410</span><br><span class="line">411</span><br><span class="line">412</span><br><span class="line">413</span><br><span class="line">414</span><br><span class="line">415</span><br><span class="line">416</span><br><span class="line">417</span><br><span class="line">418</span><br><span class="line">419</span><br><span class="line">420</span><br><span class="line">421</span><br><span class="line">422</span><br><span class="line">423</span><br><span class="line">424</span><br><span class="line">425</span><br><span class="line">426</span><br><span class="line">427</span><br><span class="line">428</span><br><span class="line">429</span><br><span class="line">430</span><br><span class="line">431</span><br><span class="line">432</span><br><span class="line">433</span><br><span class="line">434</span><br><span class="line">435</span><br><span class="line">436</span><br><span class="line">437</span><br><span class="line">438</span><br><span class="line">439</span><br><span class="line">440</span><br><span class="line">441</span><br><span class="line">442</span><br><span class="line">443</span><br><span class="line">444</span><br><span class="line">445</span><br><span class="line">446</span><br><span class="line">447</span><br><span class="line">448</span><br><span class="line">449</span><br><span class="line">450</span><br><span class="line">451</span><br><span class="line">452</span><br><span class="line">453</span><br><span class="line">454</span><br><span class="line">455</span><br><span class="line">456</span><br><span class="line">457</span><br><span class="line">458</span><br><span class="line">459</span><br><span class="line">460</span><br><span class="line">461</span><br><span class="line">462</span><br><span class="line">463</span><br><span class="line">464</span><br><span class="line">465</span><br><span class="line">466</span><br><span class="line">467</span><br><span class="line">468</span><br><span class="line">469</span><br><span class="line">470</span><br><span class="line">471</span><br><span class="line">472</span><br><span class="line">473</span><br><span class="line">474</span><br><span class="line">475</span><br><span class="line">476</span><br><span class="line">477</span><br><span class="line">478</span><br><span class="line">479</span><br><span class="line">480</span><br><span class="line">481</span><br><span class="line">482</span><br><span class="line">483</span><br><span class="line">484</span><br><span class="line">485</span><br><span class="line">486</span><br><span class="line">487</span><br><span class="line">488</span><br><span class="line">489</span><br><span class="line">490</span><br><span class="line">491</span><br><span class="line">492</span><br><span class="line">493</span><br><span class="line">494</span><br><span class="line">495</span><br><span class="line">496</span><br><span class="line">497</span><br><span class="line">498</span><br><span class="line">499</span><br><span class="line">500</span><br><span class="line">501</span><br><span class="line">502</span><br><span class="line">503</span><br><span class="line">504</span><br><span class="line">505</span><br><span class="line">506</span><br><span class="line">507</span><br><span class="line">508</span><br><span class="line">509</span><br><span class="line">510</span><br><span class="line">511</span><br><span class="line">512</span><br><span class="line">513</span><br><span class="line">514</span><br><span class="line">515</span><br><span class="line">516</span><br><span class="line">517</span><br><span class="line">518</span><br><span class="line">519</span><br><span class="line">520</span><br><span class="line">521</span><br><span class="line">522</span><br><span class="line">523</span><br><span class="line">524</span><br><span class="line">525</span><br><span class="line">526</span><br><span class="line">527</span><br><span class="line">528</span><br><span class="line">529</span><br><span class="line">530</span><br><span class="line">531</span><br><span class="line">532</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;glut.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;math.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;stdio.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;iostream&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="keyword">using</span> <span class="keyword">namespace</span> <span class="built_in">std</span>;</span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> PI 3.1415926</span></span><br><span class="line"><span class="comment">/* 每个图形最多的顶点数 */</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> MAX_VERTEX 10</span></span><br><span class="line"><span class="comment">/* 画的图形最多的个数 */</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> MAX_PLOY 10</span></span><br><span class="line"><span class="comment">/* 窗口长宽的一半 */</span></span><br><span class="line"><span class="keyword">int</span> halfWidth, halfHeight;</span><br><span class="line"><span class="comment">/* 绘制多边形的起始标志，0是开始绘制，1是结束绘制，初始为-1 */</span></span><br><span class="line"><span class="keyword">int</span>	drawStatus	= <span class="number">-1</span>;</span><br><span class="line"><span class="keyword">int</span>	moveNum		= <span class="number">-1</span>;</span><br><span class="line"><span class="comment">/* 定义点击点的x,y*/</span></span><br><span class="line"><span class="keyword">int</span> clickX, clickY;</span><br><span class="line"><span class="comment">/* 多边形结构体 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">polygon</span> &#123;</span></span><br><span class="line">	<span class="comment">/* 顶点坐标 */</span></span><br><span class="line">	<span class="keyword">int</span>	x[MAX_VERTEX];</span><br><span class="line">	<span class="keyword">int</span>	y[MAX_VERTEX];</span><br><span class="line">	<span class="comment">/* 定义第几个顶点 */</span></span><br><span class="line">	<span class="keyword">int</span>	verNum;</span><br><span class="line">	GLubyte color[<span class="number">3</span>];</span><br><span class="line">&#125;;</span><br><span class="line"><span class="comment">/* 各种颜色 */</span></span><br><span class="line">GLubyte border[<span class="number">3</span>] = &#123; <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span> &#125;;</span><br><span class="line">GLubyte grey[<span class="number">3</span>] = &#123; <span class="number">195</span>, <span class="number">195</span>, <span class="number">195</span> &#125;;</span><br><span class="line">GLubyte yellow[<span class="number">3</span>] = &#123; <span class="number">255</span>, <span class="number">243</span>, <span class="number">0</span> &#125;;</span><br><span class="line">GLubyte red[<span class="number">3</span>] = &#123; <span class="number">237</span>, <span class="number">28</span>, <span class="number">36</span> &#125;;</span><br><span class="line">GLubyte darkGrey[<span class="number">3</span>] = &#123; <span class="number">126</span>, <span class="number">126</span>, <span class="number">126</span> &#125;;</span><br><span class="line">GLubyte white[<span class="number">3</span>] = &#123; <span class="number">255</span>, <span class="number">255</span>, <span class="number">255</span> &#125;;</span><br><span class="line">GLubyte startBtn[<span class="number">3</span>] = &#123; <span class="number">10</span>, <span class="number">10</span>, <span class="number">10</span> &#125;;</span><br><span class="line">GLubyte endBtn[<span class="number">3</span>] = &#123; <span class="number">20</span>, <span class="number">20</span>, <span class="number">20</span> &#125;;</span><br><span class="line">GLubyte delBtn[<span class="number">3</span>] = &#123; <span class="number">30</span>, <span class="number">30</span>, <span class="number">30</span> &#125;;</span><br><span class="line">GLubyte moveBtn[<span class="number">3</span>] = &#123; <span class="number">40</span>, <span class="number">40</span>, <span class="number">40</span> &#125;;</span><br><span class="line"><span class="comment">/* 当前颜色 */</span></span><br><span class="line">GLubyte nowColor[<span class="number">3</span>] = &#123; <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span> &#125;;</span><br><span class="line"><span class="comment">/* 声明多边形数组 */</span></span><br><span class="line">polygon polygons[MAX_PLOY];</span><br><span class="line"><span class="comment">/* 记录画了几个多边形 */</span></span><br><span class="line"><span class="keyword">int</span> con = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 绘制多边形 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">glPolygons</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="keyword">if</span> ( con &gt;= <span class="number">0</span> )</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="keyword">for</span> ( <span class="keyword">int</span> i = <span class="number">0</span>; i &lt;= con; i++ )</span><br><span class="line">		&#123;</span><br><span class="line">			<span class="comment">/* 取到这个多边形 */</span></span><br><span class="line">			polygon poly = polygons[i];</span><br><span class="line">			<span class="comment">/* 画封闭线 */</span></span><br><span class="line">			glBegin( GL_LINE_LOOP );</span><br><span class="line">			<span class="keyword">int</span> num = poly.verNum;</span><br><span class="line">			<span class="built_in">printf</span>( <span class="string">"num:%d\n"</span>, num );</span><br><span class="line">			<span class="keyword">for</span> ( <span class="keyword">int</span> j = <span class="number">0</span>; j &lt; num; j++ )</span><br><span class="line">			&#123;</span><br><span class="line">				glColor3ub( poly.color[<span class="number">0</span>], poly.color[<span class="number">1</span>], poly.color[<span class="number">2</span>] );</span><br><span class="line">				glVertex2d( poly.x[j] - halfWidth, halfHeight - poly.y[j] );</span><br><span class="line">				<span class="built_in">printf</span>( <span class="string">"polyx:%d,polyy:%d"</span>, poly.x[j], poly.y[j] );</span><br><span class="line">			&#125;</span><br><span class="line">			<span class="comment">/* 结束画线 */</span></span><br><span class="line">			glEnd();</span><br><span class="line">			<span class="comment">/* 刷新 */</span></span><br><span class="line">			glFlush();</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 绘制填充的圆形 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">glColorCircle</span><span class="params">( <span class="keyword">int</span> x, <span class="keyword">int</span> y, <span class="keyword">int</span> R, GLubyte color[<span class="number">3</span>] )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="comment">/* 开始绘制曲线 */</span></span><br><span class="line">	glBegin( GL_POLYGON );</span><br><span class="line">	<span class="comment">/* 设置颜色 */</span></span><br><span class="line">	glColor3ub( color[<span class="number">0</span>], color[<span class="number">1</span>], color[<span class="number">2</span>] );</span><br><span class="line">	<span class="comment">/* 每次画增加的弧度 */</span></span><br><span class="line">	<span class="keyword">double</span> delta_angle = PI / <span class="number">180</span>;</span><br><span class="line">	<span class="comment">/* 画圆弧 */</span></span><br><span class="line">	<span class="keyword">for</span> ( <span class="keyword">double</span> i = <span class="number">0</span>; i &lt;= <span class="number">2</span> * PI; i += delta_angle )</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="comment">/* 绝对定位加三角函数值 */</span></span><br><span class="line">		<span class="keyword">double</span>	vx	= x + R * <span class="built_in">cos</span>( i );</span><br><span class="line">		<span class="keyword">double</span>	vy	= y + R*<span class="built_in">sin</span>( i );</span><br><span class="line">		glVertex2d( vx, vy );</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">/* 结束绘画 */</span></span><br><span class="line">	glEnd();</span><br><span class="line">	glFlush();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 画矩形，传入的是左下角XY坐标和右上角XY坐标 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">glRect</span><span class="params">( <span class="keyword">int</span> leftX, <span class="keyword">int</span> leftY, <span class="keyword">int</span> rightX, <span class="keyword">int</span> rightY )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="comment">/* 画封闭曲线 */</span></span><br><span class="line">	glBegin( GL_LINE_LOOP );</span><br><span class="line">	<span class="comment">/* 左下角 */</span></span><br><span class="line">	glVertex2d( leftX, leftY );</span><br><span class="line">	<span class="comment">/* 右下角 */</span></span><br><span class="line">	glVertex2d( rightX, leftY );</span><br><span class="line">	<span class="comment">/* 右上角 */</span></span><br><span class="line">	glVertex2d( rightX, rightY );</span><br><span class="line">	<span class="comment">/* 左上角 */</span></span><br><span class="line">	glVertex2d( leftX, rightY );</span><br><span class="line">	<span class="comment">/* 结束画线 */</span></span><br><span class="line">	glEnd();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 画圆角矩形，传入矩形宽高，角半径，矩形中心点坐标 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">glRoundRec</span><span class="params">( <span class="keyword">int</span> centerX, <span class="keyword">int</span> centerY, <span class="keyword">int</span> <span class="built_in">width</span>, <span class="keyword">int</span> <span class="built_in">height</span>, <span class="keyword">float</span> cirR )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="comment">/* 二分之PI，一个象限的角度 */</span></span><br><span class="line">	<span class="keyword">float</span> PI_HALF = PI / <span class="number">2</span>;</span><br><span class="line">	<span class="comment">/* 划分程度,值越大画得越精细 */</span></span><br><span class="line">	<span class="keyword">float</span> divide = <span class="number">20.0</span>;</span><br><span class="line">	<span class="comment">/* 圆角矩形的坐标 */</span></span><br><span class="line">	<span class="keyword">float</span> tx, ty;</span><br><span class="line">	<span class="comment">/* 画封闭曲线 */</span></span><br><span class="line">	glBegin( GL_LINE_LOOP );</span><br><span class="line">	<span class="comment">/* 四个象限不同的操作符 */</span></span><br><span class="line">	<span class="keyword">int</span>	opX[<span class="number">4</span>]	= &#123; <span class="number">1</span>, <span class="number">-1</span>, <span class="number">-1</span>, <span class="number">1</span> &#125;;</span><br><span class="line">	<span class="keyword">int</span>	opY[<span class="number">4</span>]	= &#123; <span class="number">1</span>, <span class="number">1</span>, <span class="number">-1</span>, <span class="number">-1</span> &#125;;</span><br><span class="line">	<span class="comment">/* 用来计数，从第一象限到第四象限 */</span></span><br><span class="line">	<span class="keyword">float</span> x = <span class="number">0</span>;</span><br><span class="line">	<span class="comment">/* x自增时加的值 */</span></span><br><span class="line">	<span class="keyword">float</span> part = <span class="number">1</span> / divide;</span><br><span class="line">	<span class="comment">/* 计算内矩形宽高一半的数值 */</span></span><br><span class="line">	<span class="keyword">int</span>	w	= <span class="built_in">width</span> / <span class="number">2</span> - cirR;</span><br><span class="line">	<span class="keyword">int</span>	h	= <span class="built_in">height</span> / <span class="number">2</span> - cirR;</span><br><span class="line">	<span class="comment">/* 循环画线 */</span></span><br><span class="line">	<span class="keyword">for</span> ( x = <span class="number">0</span>; x &lt; <span class="number">4</span>; x += part )</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="comment">/* 求出弧度 */</span></span><br><span class="line">		<span class="keyword">float</span> rad = PI_HALF * x;</span><br><span class="line">		<span class="comment">/* 计算坐标值 */</span></span><br><span class="line">		tx	= cirR * <span class="built_in">cos</span>( rad ) + opX[(<span class="keyword">int</span>) x] * w + centerX;</span><br><span class="line">		ty	= cirR * <span class="built_in">sin</span>( rad ) + opY[(<span class="keyword">int</span>) x] * h + centerY;</span><br><span class="line">		<span class="comment">/*传入坐标画线 */</span></span><br><span class="line">		glVertex2f( tx, ty );</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">/* 结束画线 */</span></span><br><span class="line">	glEnd();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 画弧线，相对偏移量XY，开始的弧度，结束的弧度，半径 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">glArc</span><span class="params">( <span class="keyword">double</span> x, <span class="keyword">double</span> y, <span class="keyword">double</span> start_angle, <span class="keyword">double</span> end_angle, <span class="keyword">double</span> radius )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="comment">/* 开始绘制曲线 */</span></span><br><span class="line">	glBegin( GL_LINE_STRIP );</span><br><span class="line">	<span class="comment">/* 每次画增加的弧度 */</span></span><br><span class="line">	<span class="keyword">double</span> delta_angle = PI / <span class="number">180</span>;</span><br><span class="line">	<span class="comment">/* 画圆弧 */</span></span><br><span class="line">	<span class="keyword">for</span> ( <span class="keyword">double</span> i = start_angle; i &lt;= end_angle; i += delta_angle )</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="comment">/* 绝对定位加三角函数值 */</span></span><br><span class="line">		<span class="keyword">double</span>	vx	= x + radius * <span class="built_in">cos</span>( i );</span><br><span class="line">		<span class="keyword">double</span>	vy	= y + radius*<span class="built_in">sin</span>( i );</span><br><span class="line">		glVertex2d( vx, vy );</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">/* 结束绘画 */</span></span><br><span class="line">	glEnd();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 画圆 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">glCircle</span><span class="params">( <span class="keyword">double</span> x, <span class="keyword">double</span> y, <span class="keyword">double</span> radius )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="comment">/* 画全圆 */</span></span><br><span class="line">	glArc( x, y, <span class="number">0</span>, <span class="number">2</span> * PI, radius );</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 画三角形，传入三个点的坐标 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">glTri</span><span class="params">( <span class="keyword">int</span> x1, <span class="keyword">int</span> y1, <span class="keyword">int</span> x2, <span class="keyword">int</span> y2, <span class="keyword">int</span> x3, <span class="keyword">int</span> y3 )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="comment">/* 画封闭线 */</span></span><br><span class="line">	glBegin( GL_LINE_LOOP );</span><br><span class="line">	<span class="comment">/* 一点 */</span></span><br><span class="line">	glVertex2d( x1, y1 );</span><br><span class="line">	<span class="comment">/* 二点 */</span></span><br><span class="line">	glVertex2d( x2, y2 );</span><br><span class="line">	<span class="comment">/*三点 */</span></span><br><span class="line">	glVertex2d( x3, y3 );</span><br><span class="line">	<span class="comment">/* 结束画线 */</span></span><br><span class="line">	glEnd();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 画线，传入两点坐标 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">glLine</span><span class="params">( <span class="keyword">int</span> x1, <span class="keyword">int</span> y1, <span class="keyword">int</span> x2, <span class="keyword">int</span> y2 )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="comment">/* 画封闭线 */</span></span><br><span class="line">	glBegin( GL_LINE_STRIP );</span><br><span class="line">	<span class="comment">/* 一点 */</span></span><br><span class="line">	glVertex2d( x1, y1 );</span><br><span class="line">	<span class="comment">/* 二点 */</span></span><br><span class="line">	glVertex2d( x2, y2 );</span><br><span class="line">	<span class="comment">/* 结束画线 */</span></span><br><span class="line">	glEnd();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 函数用来画图 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">display</span><span class="params">( <span class="keyword">void</span> )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="comment">/* GL_COLOR_BUFFER_BIT表示清除颜色 */</span></span><br><span class="line">	glClear( GL_COLOR_BUFFER_BIT );</span><br><span class="line">	<span class="comment">/* 设置画线颜色 */</span></span><br><span class="line">	glColor3f( <span class="number">0.5</span>, <span class="number">0.5</span>, <span class="number">0.5</span> );</span><br><span class="line">	<span class="comment">/* 画点大小 */</span></span><br><span class="line">	glPointSize( <span class="number">2</span> );</span><br><span class="line">	<span class="comment">/* 画圆角矩形，大肚子 */</span></span><br><span class="line">	glRoundRec( <span class="number">0</span>, <span class="number">0</span>, <span class="number">146</span>, <span class="number">120</span>, <span class="number">15</span> );</span><br><span class="line">	<span class="comment">/* 画圆，中间小圈 */</span></span><br><span class="line">	glCircle( <span class="number">0</span>, <span class="number">0</span>, <span class="number">10</span> );</span><br><span class="line">	<span class="comment">/* 画矩形，脖子 */</span></span><br><span class="line">	glRect( <span class="number">-25</span>, <span class="number">60</span>, <span class="number">25</span>, <span class="number">76</span> );</span><br><span class="line">	<span class="comment">/* 画圆角矩形，大脸 */</span></span><br><span class="line">	glRoundRec( <span class="number">0</span>, <span class="number">113</span>, <span class="number">128</span>, <span class="number">74</span>, <span class="number">10</span> );</span><br><span class="line">	<span class="comment">/* 两个眼睛 */</span></span><br><span class="line">	glCircle( <span class="number">-30</span>, <span class="number">111</span>, <span class="number">10</span> );</span><br><span class="line">	glCircle( <span class="number">30</span>, <span class="number">111</span>, <span class="number">10</span> );</span><br><span class="line">	<span class="comment">/* 两条天线 */</span></span><br><span class="line">	glLine( <span class="number">-35</span>, <span class="number">150</span>, <span class="number">-35</span>, <span class="number">173</span> );</span><br><span class="line">	glLine( <span class="number">35</span>, <span class="number">150</span>, <span class="number">35</span>, <span class="number">173</span> );</span><br><span class="line">	<span class="comment">/* 圆角矩形，两个耳朵 */</span></span><br><span class="line">	glRoundRec( <span class="number">81</span>, <span class="number">115</span>, <span class="number">20</span>, <span class="number">34</span>, <span class="number">5</span> );</span><br><span class="line">	glRoundRec( <span class="number">-81</span>, <span class="number">115</span>, <span class="number">20</span>, <span class="number">34</span>, <span class="number">5</span> );</span><br><span class="line">	<span class="comment">/* 圆弧，画嘴 */</span></span><br><span class="line">	glArc( <span class="number">0</span>, <span class="number">133</span>, <span class="number">11</span> * PI / <span class="number">8</span>, <span class="number">13</span> * PI / <span class="number">8</span>, <span class="number">45</span> );</span><br><span class="line">	<span class="comment">/* 画三角，肚子里的三角 */</span></span><br><span class="line">	glTri( <span class="number">-30</span>, <span class="number">-15</span>, <span class="number">30</span>, <span class="number">-15</span>, <span class="number">0</span>, <span class="number">28</span> );</span><br><span class="line">	<span class="comment">/* 画矩形，胳膊连接处 */</span></span><br><span class="line">	glRect( <span class="number">-81</span>, <span class="number">43</span>, <span class="number">-73</span>, <span class="number">25</span> );</span><br><span class="line">	glRect( <span class="number">81</span>, <span class="number">43</span>, <span class="number">73</span>, <span class="number">25</span> );</span><br><span class="line">	<span class="comment">/* 画矩形，上臂 */</span></span><br><span class="line">	glRect( <span class="number">-108</span>, <span class="number">45</span>, <span class="number">-81</span>, <span class="number">0</span> );</span><br><span class="line">	glRect( <span class="number">108</span>, <span class="number">45</span>, <span class="number">81</span>, <span class="number">0</span> );</span><br><span class="line">	<span class="comment">/* 画矩形，中臂 */</span></span><br><span class="line">	glRect( <span class="number">-101</span>, <span class="number">0</span>, <span class="number">-88</span>, <span class="number">-4</span> );</span><br><span class="line">	glRect( <span class="number">101</span>, <span class="number">0</span>, <span class="number">88</span>, <span class="number">-4</span> );</span><br><span class="line">	<span class="comment">/* 画矩形，下臂 */</span></span><br><span class="line">	glRect( <span class="number">-108</span>, <span class="number">-4</span>, <span class="number">-81</span>, <span class="number">-37</span> );</span><br><span class="line">	glRect( <span class="number">108</span>, <span class="number">-4</span>, <span class="number">81</span>, <span class="number">-37</span> );</span><br><span class="line">	<span class="comment">/* 画圆形，手掌 */</span></span><br><span class="line">	glCircle( <span class="number">-95</span>, <span class="number">-47</span>, <span class="number">10</span> );</span><br><span class="line">	glCircle( <span class="number">95</span>, <span class="number">-47</span>, <span class="number">10</span> );</span><br><span class="line"></span><br><span class="line">	<span class="comment">/* 绘制取色盘 */</span></span><br><span class="line">	glColorCircle( <span class="number">-280</span>, <span class="number">280</span>, <span class="number">10</span>, red );</span><br><span class="line">	glColorCircle( <span class="number">-250</span>, <span class="number">280</span>, <span class="number">10</span>, yellow );</span><br><span class="line">	glColorCircle( <span class="number">-220</span>, <span class="number">280</span>, <span class="number">10</span>, grey );</span><br><span class="line">	glColorCircle( <span class="number">-180</span>, <span class="number">280</span>, <span class="number">10</span>, nowColor );</span><br><span class="line">	glColorCircle( <span class="number">250</span>, <span class="number">280</span>, <span class="number">10</span>, startBtn );</span><br><span class="line">	glColorCircle( <span class="number">280</span>, <span class="number">280</span>, <span class="number">10</span>, endBtn );</span><br><span class="line">	glColorCircle( <span class="number">220</span>, <span class="number">280</span>, <span class="number">10</span>, delBtn );</span><br><span class="line">	glColorCircle( <span class="number">190</span>, <span class="number">280</span>, <span class="number">10</span>, moveBtn );</span><br><span class="line">	<span class="comment">/* 保证前面的OpenGL命令立即执行，而不是让它们在缓冲区中等待 */</span></span><br><span class="line">	<span class="comment">/* 绘制多边形 */</span></span><br><span class="line">	glPolygons();</span><br><span class="line">	glFlush();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 窗口大小变化时调用的函数 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">ChangeSize</span><span class="params">( GLsizei w, GLsizei h )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="comment">/* 避免高度为0 */</span></span><br><span class="line">	<span class="keyword">if</span> ( h == <span class="number">0</span> )</span><br><span class="line">	&#123;</span><br><span class="line">		h = <span class="number">1</span>;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">/* 定义视口大小，宽高一致 */</span></span><br><span class="line">	glViewport( <span class="number">0</span>, <span class="number">0</span>, w, h );</span><br><span class="line">	<span class="keyword">int</span> half = <span class="number">300</span>;</span><br><span class="line">	<span class="comment">/* 定义宽高的一半 */</span></span><br><span class="line">	halfHeight	= <span class="number">300</span>;</span><br><span class="line">	halfWidth	= <span class="number">300</span>;</span><br><span class="line">	<span class="comment">/* 重置坐标系统，使投影变换复位 */</span></span><br><span class="line">	glMatrixMode( GL_PROJECTION );</span><br><span class="line">	<span class="comment">/* 将当前的用户坐标系的原点移到了屏幕中心 */</span></span><br><span class="line">	glLoadIdentity();</span><br><span class="line">	<span class="comment">/* 定义正交视域体 */</span></span><br><span class="line">	<span class="keyword">if</span> ( w &lt; h )</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="comment">/* 如果高度大于宽度，则将高度视角扩大，图形显示居中 */</span></span><br><span class="line">		glOrtho( -half, half, -half * h / w, half * h / w, -half, half );</span><br><span class="line">	&#125; <span class="keyword">else</span> &#123;</span><br><span class="line">		<span class="comment">/* 如果宽度大于高度，则将宽度视角扩大，图形显示居中 */</span></span><br><span class="line">		glOrtho( -half * w / h, half * w / h, -half, half, -half, half );</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 判断两个颜色是否相等 */</span></span><br><span class="line"><span class="function"><span class="keyword">bool</span> <span class="title">sameColor</span><span class="params">( GLubyte color1[<span class="number">3</span>], GLubyte color2[<span class="number">3</span>] )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="keyword">if</span> ( color1[<span class="number">0</span>] - color2[<span class="number">0</span>] &lt; <span class="number">5</span> &amp;&amp; color1[<span class="number">1</span>] - color2[<span class="number">1</span>] &lt; <span class="number">5</span> &amp;&amp; color1[<span class="number">2</span>] - color2[<span class="number">1</span>] &lt; <span class="number">5</span> )</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="keyword">return</span>(<span class="literal">true</span>);</span><br><span class="line">	&#125; <span class="keyword">else</span> &#123;</span><br><span class="line">		<span class="keyword">return</span>(<span class="literal">false</span>);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 画点 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">glPoints</span><span class="params">( <span class="keyword">int</span> x, <span class="keyword">int</span> y )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	glBegin( GL_POINTS );</span><br><span class="line">	<span class="comment">/* 点直接设置为黑色 */</span></span><br><span class="line">	glColor3ub( <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span> );</span><br><span class="line">	glVertex2d( x - halfWidth, halfHeight - y );</span><br><span class="line">	glEnd();</span><br><span class="line">	glFlush();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 判断一个点是否在多边形内部 */</span></span><br><span class="line"><span class="function"><span class="keyword">bool</span> <span class="title">pointInPoly</span><span class="params">( polygon poly, <span class="keyword">int</span> x, <span class="keyword">int</span> y )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="keyword">int</span> nCross = <span class="number">0</span>;</span><br><span class="line">	<span class="keyword">for</span> ( <span class="keyword">int</span> i = <span class="number">0</span>; i &lt; poly.verNum; i++ )</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="keyword">int</span>	p1x	= poly.x[i];</span><br><span class="line">		<span class="keyword">int</span>	p1y	= poly.y[i];</span><br><span class="line">		<span class="keyword">int</span>	p2x	= poly.x[(i + <span class="number">1</span>) % poly.verNum];</span><br><span class="line">		<span class="keyword">int</span>	p2y	= poly.y[(i + <span class="number">1</span>) % poly.verNum];</span><br><span class="line">		<span class="comment">/* 平行或在延长线上，忽略 */</span></span><br><span class="line">		<span class="keyword">if</span> ( p1y == p2y || y &lt; <span class="built_in">min</span>( p1y, p2y ) || y &gt; <span class="built_in">max</span>( p1y, p2y ) )</span><br><span class="line">		&#123;</span><br><span class="line">			<span class="keyword">continue</span>;</span><br><span class="line">		&#125;</span><br><span class="line">		<span class="comment">/* 计算交点横坐标 */</span></span><br><span class="line">		<span class="keyword">double</span> m = (<span class="keyword">double</span>) (y - p1y) * (<span class="keyword">double</span>) (p2x - p1x) / (<span class="keyword">double</span>) (p2y - p1y) + p1x;</span><br><span class="line">		<span class="keyword">if</span> ( m &gt; x )</span><br><span class="line">			nCross++;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">return</span>(nCross % <span class="number">2</span> == <span class="number">1</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 移动多边形 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">movePoly</span><span class="params">( <span class="keyword">int</span> x, <span class="keyword">int</span> y )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="comment">/* 取到要移动的图形 */</span></span><br><span class="line">	<span class="keyword">int</span> verNum = polygons[moveNum].verNum;</span><br><span class="line">	<span class="built_in">printf</span>( <span class="string">"verNum%d,x%d,y%d,clickX%d,clickY%d\n"</span>, verNum, x, y, clickX, clickY );</span><br><span class="line">	<span class="keyword">for</span> ( <span class="keyword">int</span> i = <span class="number">0</span>; i &lt; verNum; i++ )</span><br><span class="line">	&#123;</span><br><span class="line">		polygons[moveNum].x[i]	+= (x - clickX);</span><br><span class="line">		polygons[moveNum].y[i]	+= (y - clickY);</span><br><span class="line">		<span class="built_in">printf</span>( <span class="string">"polyx%d\n"</span>, polygons[moveNum].x[i] );</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">/* 移动完毕之后重新记录当前的点 */</span></span><br><span class="line">	clickX	= x;</span><br><span class="line">	clickY	= y;</span><br><span class="line">	<span class="comment">/* 重新绘制 */</span></span><br><span class="line">	glutPostRedisplay();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 删除多边形 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">removePoly</span><span class="params">( <span class="keyword">int</span> index )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="keyword">if</span> ( index &gt; con )</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="built_in">printf</span>( <span class="string">"Out Of Index\n"</span> );</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">for</span> ( <span class="keyword">int</span> i = index; i &lt; con; i++ )</span><br><span class="line">	&#123;</span><br><span class="line">		polygons[i] = polygons[i + <span class="number">1</span>];</span><br><span class="line">	&#125;</span><br><span class="line">	con--;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 删除多边形 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">deletePoly</span><span class="params">( <span class="keyword">int</span> x, <span class="keyword">int</span> y )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="keyword">int</span> delenum = <span class="number">-1</span>;</span><br><span class="line">	<span class="keyword">for</span> ( <span class="keyword">int</span> i = <span class="number">0</span>; i &lt; con; i++ )</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="keyword">if</span> ( pointInPoly( polygons[i], x, y ) )</span><br><span class="line">		&#123;</span><br><span class="line">			delenum = i;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">if</span> ( delenum != <span class="number">-1</span> )</span><br><span class="line">	&#123;</span><br><span class="line">		removePoly( delenum );</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">/* 重新绘制 */</span></span><br><span class="line">	glutPostRedisplay();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/*鼠标点击事件 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">mouseClick</span><span class="params">( <span class="keyword">int</span> btn, <span class="keyword">int</span> state, <span class="keyword">int</span> x, <span class="keyword">int</span> y )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="comment">/* 赋值全局变量 */</span></span><br><span class="line">	clickX	= x;</span><br><span class="line">	clickY	= y;</span><br><span class="line">	<span class="comment">/* 选项卡的分界范围 */</span></span><br><span class="line">	<span class="keyword">int</span>	optionHeight	= <span class="number">40</span>;</span><br><span class="line">	<span class="keyword">int</span>	optionWidth	= <span class="number">250</span>;</span><br><span class="line">	<span class="keyword">if</span> ( btn == GLUT_LEFT_BUTTON &amp;&amp; state == GLUT_DOWN )</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="comment">/* 如果在颜色选项卡中点击 */</span></span><br><span class="line">		<span class="keyword">if</span> ( y &lt; optionHeight &amp;&amp; x &lt; optionWidth )</span><br><span class="line">		&#123;</span><br><span class="line">			glReadPixels( x, <span class="number">2</span> * halfHeight - y, <span class="number">1</span>, <span class="number">1</span>, GL_RGB, GL_UNSIGNED_BYTE, &amp;nowColor );</span><br><span class="line">			<span class="built_in">printf</span>( <span class="string">"r:%d,g:%d,b:%d\n"</span>, nowColor[<span class="number">0</span>], nowColor[<span class="number">1</span>], nowColor[<span class="number">2</span>] );</span><br><span class="line">			<span class="comment">/* 设置绘图颜色并显示当前取色板颜色 */</span></span><br><span class="line">			glColorCircle( <span class="number">-180</span>, <span class="number">280</span>, <span class="number">10</span>, nowColor );</span><br><span class="line">			<span class="comment">/* 如果点击的是右侧选项按钮 */</span></span><br><span class="line">		&#125;<span class="keyword">else</span> <span class="keyword">if</span> ( y &lt; optionHeight &amp;&amp; x &gt; optionWidth )</span><br><span class="line">		&#123;</span><br><span class="line">			<span class="comment">/* 取当前的点 */</span></span><br><span class="line">			GLubyte color[<span class="number">3</span>];</span><br><span class="line">			glReadPixels( x, <span class="number">2</span> * halfHeight - y, <span class="number">1</span>, <span class="number">1</span>, GL_RGB, GL_UNSIGNED_BYTE, &amp;color );</span><br><span class="line">			<span class="built_in">printf</span>( <span class="string">"r:%d,g:%d,b:%d\n"</span>, color[<span class="number">0</span>], color[<span class="number">1</span>], color[<span class="number">2</span>] );</span><br><span class="line">			<span class="comment">/* 如果点击了开始绘制的按钮 */</span></span><br><span class="line">			<span class="keyword">if</span> ( sameColor( color, startBtn ) )</span><br><span class="line">			&#123;</span><br><span class="line">				drawStatus = <span class="number">0</span>;</span><br><span class="line">				<span class="comment">/* 开始画一个图形，顶点个数置零 */</span></span><br><span class="line">				polygons[con].verNum = <span class="number">0</span>;</span><br><span class="line">				<span class="built_in">printf</span>( <span class="string">"drawStatus:%d\n"</span>, drawStatus );</span><br><span class="line">				<span class="comment">/* 如果点击了结束绘制的按钮 */</span></span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> ( sameColor( color, endBtn ) )</span><br><span class="line">			&#123;</span><br><span class="line">				glutPostRedisplay();</span><br><span class="line">				<span class="comment">/* 画的图形个数加一 */</span></span><br><span class="line">				con++;</span><br><span class="line">				<span class="built_in">printf</span>( <span class="string">"drawStatus:%d\n"</span>, drawStatus );</span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> ( sameColor( color, delBtn ) )</span><br><span class="line">			&#123;</span><br><span class="line">				<span class="comment">/* 删除时设置drawStatus为2 */</span></span><br><span class="line">				drawStatus = <span class="number">2</span>;</span><br><span class="line">				<span class="built_in">printf</span>( <span class="string">"drawStatus:%d\n"</span>, drawStatus );</span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> ( sameColor( color, moveBtn ) )</span><br><span class="line">			&#123;</span><br><span class="line">				<span class="comment">/* 移动时设置drawStatus为3 */</span></span><br><span class="line">				drawStatus = <span class="number">3</span>;</span><br><span class="line">				<span class="built_in">printf</span>( <span class="string">"drawStatus:%d\n"</span>, drawStatus );</span><br><span class="line">			&#125;</span><br><span class="line"></span><br><span class="line">			<span class="comment">/* 如果点击的是下方的绘图页面 */</span></span><br><span class="line">		&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">			<span class="comment">/* 如果当前是正在取点状态 */</span></span><br><span class="line">			<span class="keyword">if</span> ( drawStatus == <span class="number">0</span> )</span><br><span class="line">			&#123;</span><br><span class="line">				<span class="comment">/* 保存每个点，然后该图形顶点个数加一 */</span></span><br><span class="line">				polygons[con].x[polygons[con].verNum]	= x;</span><br><span class="line">				polygons[con].y[polygons[con].verNum]	= y;</span><br><span class="line">				<span class="comment">/* 画点 */</span></span><br><span class="line">				glPoints( x, y );</span><br><span class="line">				<span class="comment">/* 设置当前颜色RGB，如果取色有变动，以最后的取色为准 */</span></span><br><span class="line">				polygons[con].color[<span class="number">0</span>]	= nowColor[<span class="number">0</span>];</span><br><span class="line">				polygons[con].color[<span class="number">1</span>]	= nowColor[<span class="number">1</span>];</span><br><span class="line">				polygons[con].color[<span class="number">2</span>]	= nowColor[<span class="number">2</span>];</span><br><span class="line">				<span class="built_in">printf</span>( <span class="string">"polyColor%d%d%d\n"</span>, polygons[con].color[<span class="number">0</span>], polygons[con].color[<span class="number">1</span>], polygons[con].color[<span class="number">2</span>] );</span><br><span class="line">				polygons[con].verNum++;</span><br><span class="line">				<span class="built_in">printf</span>( <span class="string">"con:%d,verNum:%d\n"</span>, con, polygons[con].verNum );</span><br><span class="line">			&#125;<span class="keyword">else</span> <span class="keyword">if</span> ( drawStatus == <span class="number">2</span> )</span><br><span class="line">			&#123;</span><br><span class="line">				<span class="comment">/* 删除图形 */</span></span><br><span class="line">				deletePoly( x, y );</span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> ( drawStatus == <span class="number">3</span> )</span><br><span class="line">			&#123;</span><br><span class="line">				moveNum = <span class="number">-1</span>;</span><br><span class="line">				<span class="keyword">for</span> ( <span class="keyword">int</span> i = <span class="number">0</span>; i &lt; con; i++ )</span><br><span class="line">				&#123;</span><br><span class="line">					<span class="keyword">if</span> ( pointInPoly( polygons[i], x, y ) )</span><br><span class="line">					&#123;</span><br><span class="line">						moveNum = i;</span><br><span class="line">					&#125;</span><br><span class="line">				&#125;</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 鼠标移动事件 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">mouseMove</span><span class="params">( <span class="keyword">int</span> x, <span class="keyword">int</span> y )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="keyword">if</span> ( drawStatus == <span class="number">3</span> &amp;&amp; moveNum != <span class="number">-1</span> )</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="built_in">printf</span>( <span class="string">"move x:%d,y:%dmoveNum:%d\n"</span>, x, y, moveNum );</span><br><span class="line">		movePoly( x, y );</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/*程序入口 */</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">( <span class="keyword">int</span> argc, <span class="keyword">char</span> *argv[] )</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	<span class="comment">/* 对GLUT进行初始化，并处理所有的命令行参数 */</span></span><br><span class="line">	glutInit( &amp;argc, argv );</span><br><span class="line">	<span class="comment">/* 指定RGB颜色模式和单缓冲窗口 */</span></span><br><span class="line">	glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE );</span><br><span class="line">	<span class="comment">/* 定义窗口的位置 */</span></span><br><span class="line">	glutInitWindowPosition( <span class="number">100</span>, <span class="number">100</span> );</span><br><span class="line">	<span class="comment">/* 定义窗口的大小 */</span></span><br><span class="line">	glutInitWindowSize( <span class="number">600</span>, <span class="number">600</span> );</span><br><span class="line">	<span class="comment">/* 创建窗口，同时为之命名 */</span></span><br><span class="line">	glutCreateWindow( <span class="string">"OpenGL"</span> );</span><br><span class="line">	<span class="comment">/* 设置窗口清除颜色为白色 */</span></span><br><span class="line">	glClearColor( <span class="number">1.0f</span>, <span class="number">1.0f</span>, <span class="number">1.0f</span>, <span class="number">1.0f</span> );</span><br><span class="line">	<span class="comment">/* 参数为一个函数，绘图时这个函数就会被调用 */</span></span><br><span class="line">	glutDisplayFunc( &amp;<span class="built_in">display</span> );</span><br><span class="line">	<span class="comment">/* 参数为一个函数，当窗口大小改变时会被调用 */</span></span><br><span class="line">	glutReshapeFunc( ChangeSize );</span><br><span class="line">	<span class="comment">/*鼠标点击事件，鼠标点击或者松开时调用 */</span></span><br><span class="line">	glutMouseFunc( mouseClick );</span><br><span class="line">	<span class="comment">/*鼠标移动事件，鼠标按下并移动时调用 */</span></span><br><span class="line">	glutMotionFunc( mouseMove );</span><br><span class="line">	<span class="comment">/* 该函数让GLUT框架开始运行，所有设置的回调函数开始工作，直到用户终止程序为止 */</span></span><br><span class="line">	glutMainLoop();</span><br><span class="line">	<span class="comment">/*程序返回 */</span></span><br><span class="line">	<span class="keyword">return</span>(<span class="number">0</span>);</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>以上，就可以实现图形的移动和删除了。</p>
                <h2 id="存盘和读盘"><a href="#存盘和读盘" class="headerlink" title="存盘和读盘"></a>存盘和读盘</h2>
                <p>这个很简单，存盘我们只需要把所有图形的位置以及颜色输出到一个文本中，然后在读盘时，把文本中所有内容读入并存储到多边形结构体数组中，然后重新绘制即可。 代码的讲解直接写在注释中，比较好理解</p>
                <figure class="highlight mipsasm">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">/* 保存所有的图形 */</span></span><br><span class="line">void savePolygons()</span><br><span class="line">&#123;</span><br><span class="line">	FILE *<span class="built_in">fp</span>;</span><br><span class="line">	int i;</span><br><span class="line">	if ((<span class="built_in">fp</span> = fopen(<span class="string">"shapes.txt"</span>, <span class="string">"w"</span>)) == NULL)</span><br><span class="line">	&#123;</span><br><span class="line">		printf(<span class="string">"不能打开文件!"</span>);</span><br><span class="line">		return;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">/* 保存一共多少个图形 */</span></span><br><span class="line">	fprintf(<span class="built_in">fp</span>, <span class="string">"%d"</span>, con);</span><br><span class="line">	fprintf(<span class="built_in">fp</span>, <span class="string">"\n"</span>);</span><br><span class="line">	for (i = <span class="number">0</span><span class="comment">; i &lt; con; i++)&#123;</span></span><br><span class="line">		<span class="comment">/* 保存颜色值 */</span></span><br><span class="line">		fprintf(<span class="built_in">fp</span>, <span class="string">"%d %d %d "</span>, polygons[i].color[<span class="number">0</span>], polygons[i].color[<span class="number">1</span>], polygons[i].color[<span class="number">2</span>]);</span><br><span class="line">		<span class="comment">/* 保存顶点数量 */</span></span><br><span class="line">		fprintf(<span class="built_in">fp</span>, <span class="string">"%d "</span>, polygons[i].verNum);</span><br><span class="line">		<span class="comment">/* 保存顶点坐标 */</span></span><br><span class="line">		for (int <span class="keyword">j </span>= <span class="number">0</span><span class="comment">; j &lt; polygons[i].verNum; j++)</span></span><br><span class="line">			fprintf(<span class="built_in">fp</span>, <span class="string">"%d "</span>, polygons[i].x[<span class="keyword">j]);</span></span><br><span class="line"><span class="keyword">	</span>	for (int <span class="keyword">j </span>= <span class="number">0</span><span class="comment">; j &lt; polygons[i].verNum; j++)</span></span><br><span class="line">			fprintf(<span class="built_in">fp</span>, <span class="string">"%d "</span>, polygons[i].y[<span class="keyword">j]);</span></span><br><span class="line"><span class="keyword">	</span>	fprintf(<span class="built_in">fp</span>, <span class="string">"\n"</span>);</span><br><span class="line">	&#125;</span><br><span class="line">	fclose(<span class="built_in">fp</span>);</span><br><span class="line">	printf(<span class="string">"保存成功。\n"</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 读取存档 */</span></span><br><span class="line">void readPolygons()</span><br><span class="line">&#123;</span><br><span class="line">	FILE *<span class="built_in">fp</span>;</span><br><span class="line">	int i;</span><br><span class="line">	if ((<span class="built_in">fp</span> = fopen(<span class="string">"shapes.txt"</span>, <span class="string">"r"</span>)) == NULL)</span><br><span class="line">	&#123;</span><br><span class="line">		printf(<span class="string">"不能打开文件!"</span>);</span><br><span class="line">		return;</span><br><span class="line">	&#125;</span><br><span class="line">	fscanf(<span class="built_in">fp</span>, <span class="string">"%d"</span>, &amp;con);</span><br><span class="line">	printf(<span class="string">"count%d"</span>,con);</span><br><span class="line">	fscanf(<span class="built_in">fp</span>, <span class="string">"\n"</span>);</span><br><span class="line">	for (i = <span class="number">0</span><span class="comment">; i &lt; con; i++)&#123;</span></span><br><span class="line">		<span class="comment">/* 读取颜色值 */</span></span><br><span class="line">		fscanf(<span class="built_in">fp</span>, <span class="string">"%d %d %d "</span>, &amp;polygons[i].color[<span class="number">0</span>], &amp;polygons[i].color[<span class="number">1</span>], &amp;polygons[i].color[<span class="number">2</span>]);</span><br><span class="line">		<span class="comment">/* 读取顶点数量 */</span></span><br><span class="line">		fscanf(<span class="built_in">fp</span>, <span class="string">"%d "</span>, &amp;polygons[i].verNum);</span><br><span class="line">		<span class="comment">/* 读取顶点坐标 */</span></span><br><span class="line">		for (int <span class="keyword">j </span>= <span class="number">0</span><span class="comment">; j &lt; polygons[i].verNum; j++)</span></span><br><span class="line">			fscanf(<span class="built_in">fp</span>, <span class="string">"%d "</span>, &amp;polygons[i].x[<span class="keyword">j]);</span></span><br><span class="line"><span class="keyword">	</span>	for (int <span class="keyword">j </span>= <span class="number">0</span><span class="comment">; j &lt; polygons[i].verNum; j++)</span></span><br><span class="line">			fscanf(<span class="built_in">fp</span>, <span class="string">"%d "</span>, &amp;polygons[i].y[<span class="keyword">j]);</span></span><br><span class="line"><span class="keyword">	</span>	fscanf(<span class="built_in">fp</span>, <span class="string">"\n"</span>);</span><br><span class="line">	&#125;</span><br><span class="line">	fclose(<span class="built_in">fp</span>);</span><br><span class="line">	printf(<span class="string">"读取成功。\n"</span>);</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>我们只需要再定义两个按钮，再display中画上这俩按钮</p>
                <figure class="highlight angelscript">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">GLubyte storeBtn[<span class="number">3</span>] = &#123;<span class="number">50</span>, <span class="number">50</span>, <span class="number">50</span>&#125;;</span><br><span class="line">GLubyte loadBtn[<span class="number">3</span>] = &#123;<span class="number">55</span>, <span class="number">55</span>, <span class="number">55</span>&#125;;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>然后把mouseClick方法改写一下就好了。最终mouseClick方法如下</p>
                <figure class="highlight reasonml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">/* 鼠标点击事件 */</span></span><br><span class="line">void mouse<span class="constructor">Click( <span class="params">int</span> <span class="params">btn</span>, <span class="params">int</span> <span class="params">state</span>, <span class="params">int</span> <span class="params">x</span>, <span class="params">int</span> <span class="params">y</span> )</span></span><br><span class="line">&#123;</span><br><span class="line">	<span class="comment">/* 赋值全局变量 */</span></span><br><span class="line">	clickX	= x;</span><br><span class="line">	clickY	= y;</span><br><span class="line">	<span class="comment">/* 选项卡的分界范围 */</span></span><br><span class="line">	<span class="built_in">int</span>	optionHeight	= <span class="number">40</span>;</span><br><span class="line">	<span class="built_in">int</span>	optionWidth	= <span class="number">250</span>;</span><br><span class="line">	<span class="keyword">if</span> ( btn<span class="operator"> == </span>GLUT_LEFT_BUTTON<span class="operator"> &amp;&amp; </span>state<span class="operator"> == </span>GLUT_DOWN )</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="comment">/* 如果在颜色选项卡中点击 */</span></span><br><span class="line">		<span class="keyword">if</span> ( y &lt; optionHeight<span class="operator"> &amp;&amp; </span>x &lt; optionWidth )</span><br><span class="line">		&#123;</span><br><span class="line">			gl<span class="constructor">ReadPixels( <span class="params">x</span>, 2 <span class="operator">*</span> <span class="params">halfHeight</span> - <span class="params">y</span>, 1, 1, GL_RGB, GL_UNSIGNED_BYTE, &amp;<span class="params">nowColor</span> )</span>;</span><br><span class="line">			<span class="comment">/* 设置绘图颜色并显示当前取色板颜色 */</span></span><br><span class="line">			gl<span class="constructor">ColorCircle( -180, 280, 10, <span class="params">nowColor</span> )</span>;</span><br><span class="line">			<span class="comment">/* 如果点击的是右侧选项按钮 */</span></span><br><span class="line">		&#125;<span class="keyword">else</span> <span class="keyword">if</span> ( y &lt; optionHeight<span class="operator"> &amp;&amp; </span>x &gt; optionWidth )</span><br><span class="line">		&#123;</span><br><span class="line">			<span class="comment">/* 取当前的点 */</span></span><br><span class="line">			GLubyte color<span class="literal">[<span class="number">3</span>]</span>;</span><br><span class="line">			gl<span class="constructor">ReadPixels( <span class="params">x</span>, 2 <span class="operator">*</span> <span class="params">halfHeight</span> - <span class="params">y</span>, 1, 1, GL_RGB, GL_UNSIGNED_BYTE, &amp;<span class="params">color</span> )</span>;</span><br><span class="line">			<span class="comment">/* 如果点击了开始绘制的按钮 */</span></span><br><span class="line">			<span class="keyword">if</span> ( same<span class="constructor">Color( <span class="params">color</span>, <span class="params">startBtn</span> )</span> )</span><br><span class="line">			&#123;</span><br><span class="line">				drawStatus = <span class="number">0</span>;</span><br><span class="line">				<span class="comment">/* 开始画一个图形，顶点个数置零 */</span></span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.verNum = <span class="number">0</span>;</span><br><span class="line">				<span class="comment">/* 如果点击了结束绘制的按钮 */</span></span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> ( same<span class="constructor">Color( <span class="params">color</span>, <span class="params">endBtn</span> )</span> )</span><br><span class="line">			&#123;</span><br><span class="line">				glut<span class="constructor">PostRedisplay()</span>;</span><br><span class="line">				<span class="comment">/* 画的图形个数加一 */</span></span><br><span class="line">				con++;</span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> ( same<span class="constructor">Color( <span class="params">color</span>, <span class="params">delBtn</span> )</span> )</span><br><span class="line">			&#123;</span><br><span class="line">				<span class="comment">/* 删除时设置drawStatus为2 */</span></span><br><span class="line">				drawStatus = <span class="number">2</span>;</span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> ( same<span class="constructor">Color( <span class="params">color</span>, <span class="params">moveBtn</span> )</span> )</span><br><span class="line">			&#123;</span><br><span class="line">				<span class="comment">/* 移动时设置drawStatus为3 */</span></span><br><span class="line">				drawStatus = <span class="number">3</span>;</span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> ( same<span class="constructor">Color( <span class="params">color</span>, <span class="params">storeBtn</span> )</span> )</span><br><span class="line">			&#123;</span><br><span class="line">				<span class="comment">/* 存盘时设置drawStatus为4 */</span></span><br><span class="line">				drawStatus = <span class="number">4</span>;</span><br><span class="line">				glut<span class="constructor">PostRedisplay()</span>;</span><br><span class="line">				save<span class="constructor">Polygons()</span>;</span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> ( same<span class="constructor">Color( <span class="params">color</span>, <span class="params">loadBtn</span> )</span> )</span><br><span class="line">			&#123;</span><br><span class="line">				<span class="comment">/* 读盘时设置drawStatus为5 */</span></span><br><span class="line">				drawStatus = <span class="number">5</span>;</span><br><span class="line">				read<span class="constructor">Polygons()</span>;</span><br><span class="line">				glut<span class="constructor">PostRedisplay()</span>;</span><br><span class="line">			&#125;</span><br><span class="line"></span><br><span class="line">			<span class="comment">/* 如果点击的是下方的绘图页面 */</span></span><br><span class="line">		&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">			<span class="comment">/* 如果当前是正在取点状态 */</span></span><br><span class="line">			<span class="keyword">if</span> ( drawStatus<span class="operator"> == </span><span class="number">0</span> )</span><br><span class="line">			&#123;</span><br><span class="line">				<span class="comment">/* 保存每个点，然后该图形顶点个数加一 */</span></span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.x<span class="literal">[<span class="identifier">polygons</span>[<span class="identifier">con</span>]</span>.verNum]	= x;</span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.y<span class="literal">[<span class="identifier">polygons</span>[<span class="identifier">con</span>]</span>.verNum]	= y;</span><br><span class="line">				<span class="comment">/* 画点 */</span></span><br><span class="line">				gl<span class="constructor">Points( <span class="params">x</span>, <span class="params">y</span> )</span>;</span><br><span class="line">				<span class="comment">/* 设置当前颜色RGB，如果取色有变动，以最后的取色为准 */</span></span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">0</span>]</span>	= nowColor<span class="literal">[<span class="number">0</span>]</span>;</span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">1</span>]</span>	= nowColor<span class="literal">[<span class="number">1</span>]</span>;</span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.color<span class="literal">[<span class="number">2</span>]</span>	= nowColor<span class="literal">[<span class="number">2</span>]</span>;</span><br><span class="line">				polygons<span class="literal">[<span class="identifier">con</span>]</span>.verNum++;</span><br><span class="line">			&#125;<span class="keyword">else</span> <span class="keyword">if</span> ( drawStatus<span class="operator"> == </span><span class="number">2</span> )</span><br><span class="line">			&#123;</span><br><span class="line">				<span class="comment">/* 删除图形 */</span></span><br><span class="line">				delete<span class="constructor">Poly( <span class="params">x</span>, <span class="params">y</span> )</span>;</span><br><span class="line">			&#125; <span class="keyword">else</span> <span class="keyword">if</span> ( drawStatus<span class="operator"> == </span><span class="number">3</span> )</span><br><span class="line">			&#123;</span><br><span class="line">				moveNum = -<span class="number">1</span>;</span><br><span class="line">				for ( <span class="built_in">int</span> i = <span class="number">0</span>; i &lt; con; i++ )</span><br><span class="line">				&#123;</span><br><span class="line">					<span class="keyword">if</span> ( point<span class="constructor">InPoly( <span class="params">polygons</span>[<span class="params">i</span>], <span class="params">x</span>, <span class="params">y</span> )</span> )</span><br><span class="line">					&#123;</span><br><span class="line">						moveNum = i;</span><br><span class="line">					&#125;</span><br><span class="line">				&#125;</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>大功告成！现在只要你存盘成功，不管对图形进行怎样的移动，删除操作。只要再点击读盘，就可以恢复到存盘时的状态，是不是非常酷炫。 大家可以尝试一下！</p>
                <h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2>
                <p>本篇文章说明了图形的删除，移动以及存盘读盘的功能。代码实现仅仅是我个人的思路，当然实现方式不止这一种，欢迎大家创新。 部分思路如果大家有更好的解决方法，欢迎同我交流，非常感谢。 总之希望对大家有帮助！小伙伴们加油！</p>
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                  <li class="nav-item nav-level-2"><a class="nav-link" href="#综述"><span class="nav-number">1.</span> <span class="nav-text">综述</span></a></li>
                  <li class="nav-item nav-level-2"><a class="nav-link" href="#图形删除"><span class="nav-number">2.</span> <span class="nav-text">图形删除</span></a>
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